Virginia’s North Anna nuclear power plant reported to the Nuclear Regulatory Commission (NRC) this morning that, while removing used fuel rods from the Unit 2 reactor, two damaged used fuel rod assemblies were discovered. According to the Event Report:
Initial inspection of the fuel assembly identified two (2) visibly split fuel pins of eight (8) to ten (10) inches long with visible damage to the top of the pins. The internals of the affected pins are visible and the springs from the top of each pellet stack are touching the top nozzle.
The Event Report provided these additional details:
On September 15, 2014, at 0900 [EDT], subsequent video inspection of the fuel assembly identified that the top springs of the two (2) fuel pins were dislodged. Video inspection of the reactor vessel identified debris that has the potential to be fragments of fuel pellets resting on the core plate. Additional investigations are in progress.